MUC5AC and gastric cancer: We matched eight H. pylori-positive, APCA-negative patients to eight pure AIG patients by propensity scoring; we investigated mucin type, PD-L1 expression, infiltration of CD3/CD11b/Foxp3/PD1-positive cells, and bacteria in gastric cancer regions by immunohistochemical staining (Table 3 and Table 4 and Figure 3, Figure 4 and Figure 5).